1. Juliet Keidan Institute of Paediatric Gastroenterology, Shaare Zedek Medical Center, Jerusalem, Israel
2. Hebrew University of Jerusalem, Jerusalem, Israel
3. University of Jan Kochanowski, Kielce, Poland
4. Children’s Memorial Health Institute, Warsaw, Poland
5. Medical University of Warsaw, Warsaw, Poland
6. Jagiellonian University Medical College, Krakow, Poland
7. Pediatric Gastroenterology and Cystic Fibrosis Unit, Department of Human Pathology in Adulthood and Childhood “G. Barresi”, University of Messina, Messina, Italy
8. Medical University of Silesia, Katowice, Poland
9. Great Ormond Street Hospital, London, United Kingdom
10. University of Warmia and Mazury, Olsztyn, Poland
11. Department of Pediatrics and Pediatric Gastroenterology, Institute of Medical Sciences, Medical College, University of Rzeszów, Rzeszów, Poland
12. Polish Mother’s Memorial Hospital, Lodz, Poland
13. Children’s Hospital Zagreb, University of Zagreb Medical School, Zagreb, Croatia
14. Ludwik Rydygier Collegium Medicum, Bydgoszcz, Poland
15. University Hospital Brussels, Brussels, Belgium
16. Pediatric Gastroenterology and Hepatology Unit, Cliniques Universitaires Saint-Luc, Brussels, Belgium
17. Sheffield Children’s Hospital, Sheffield, United Kingdom
18. Pediatric Gastroenterology and Liver Unit, Maternal and Child Health Department, Sapienza University of Rome, Rome, Italy
19. University Children’s Hospital, Basel, Switzerland
20. Al Jalila Children’s Specialty Hospital, Dubai, United Arab Emirates
21. Cedars-Sinai Medical Center, Los Angles, CA
22. Ochsner Hospital for Children, New Orleans, LA
23. Children’s Hospital of Philadelphia, Philadelphia, PA
24. Sinai Children’s Hospital, Chicago, IL
25. Univ. Lille, CHU Lille, Gastroentérologie, Hépatologie et Nutrition Pédiatrique, Hôpital Jeanne de Flandre, Lille, France
26. University Children’s Hospital, Medical Faculty, Ljubljana, Slovenia.